package cn.feng.thinkInJava.a9_2_泛型.generics.a15_10_00;
/*package cn.feng.thinkInJava.a9_2_泛型.generics;

//: generics/GenericsAndCovariance.java
import java.util.*;

public class GenericsAndCovariance
{
	public static void main(String[] args)
	{
		// Wildcards allow covariance:
		List<? extends Fruit> flist=new ArrayList<Apple>();
		// Compile Error: can't add any type of object:
		// flist.add(new Apple());
		// flist.add(new Fruit());
		// flist.add(new Object());
		flist.add(null); // Legal but uninteresting
		// We know that it returns at least Fruit:
		Fruit f=flist.get(0);
	}
} // /:~
*/